I've played with both. While I can do a RPB backhand, I much prefer TPB for various reasons.
So which one to play? I've played plenty with both. I'm convinced Cpen is better choice and the reason is simple. You have more options on your backhand with Cpen vs Jpen. Even if you're a TPB type player. With Cpen you can, and should, put some type of pips or anti on that RPB. You'll be amazed how useful of a tool that will serve you in your matches from time to time. Want to play an entire match and never use that RPB side much like a standard Jpener would? Fine. You can. if you're a TPB player you're probably use to that. But it's there as an option.
Get pulled out to your far forehand in a rally and you loop it, they block to the open side. You're boned with Jpen.
Example: A match from a high level Jpen player I like to follow because i'm also left handed. This guy is a very skilled player.
The point at 1:25 in this video
Now same situation with Cpen namely with say a long pips on on there. Pulled to the far FH, next ball? RPB chop to buy your self time to reset and get back in the point. So much easier.
Ever ran into a player you don't know at say a tournament and their serve is giving you fits? Sure if you played them in a few matches you'd eventually get a feel for it but this is a tournament. You have 3 games or so. You can't really afford to forfeit 1 or 2 of them while you figure it out. - RPB Long pips can be an easy savior while also possibly frustrating them as they have to face their own serve. Then when you mix in a return of standard TPB with inverted every once in a while, it'll truly keep them off-balance.
Ever faced a shakehander with a good backhand and they're BH driving at you while you TPB block and they just naturally are the ones in the rally with more speed & spin? Feel like they're the hammer and you're the nail? Mix in a close to the table RPB chock block (it's rather easy). Change the pace & spin. You don't have to play their game.
If you're a TPB player, you owe it to yourself to try this setup at least once in your life. You could become a twiddling player and really open up options but for me personally, that's too much different muscle memory to learn and I prefer to just keep the weird rubber on the RPB only pulling it out when I want to.
I'm also of the opinion that if one absolutely insists on Jpen (because there are elements I like too. Namely the power they provide), then I'd favor one of those two sided Jpens for say an OX LPs on the back side where it's the same concept and you still get all the available options I'm talking about.
Now having made my case, I'll feature another player here I like to watch for strategic pointers in regards to playing with reversing rubber. Now he's a shakehander and very good but I'm telling you if you're a Cpen player with a LPs or anti on the backhand side, you can play the exact same way this guy does (when he gets a chance to step around a play an attacking FH he does) but with the option to even hit with the inverted TPB where as this player can't. If it's going to his BH, he's for sure using the anti. You as a penholder still get to choose. The options in style of play of what suits you feel endless. RPB subtle chop block at the table is quite easy.